One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,9)(4,12)(5,7)(6,10)(8,14)(11,16)(13,15)(17,18)(19,26)(20,29)(21,24)(22,27)(23,28)(25,31)(30,32) involution — undirected(1,3,5,11)(2,6,7,15)(4,13,14,10)(8,16,12,9)(17,19,22,21)(18,23,27,32)(20,30,31,28)(24,29,26,25)(1,2)(3,6)(4,8)(5,7)(9,10)(11,15)(12,14)(13,16)(18,24)(19,21)(20,31)(23,25)(26,27)(29,32) involution — undirected(2,7)(6,15)(8,12)(9,16)(17,19,22,21)(18,24,27,26)(20,28,31,30)(23,29,32,25)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.